<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM – Open Source CRM application.
 * Copyright (C) 2014-2025 EspoCRM, Inc.
 * Website: https://www.espocrm.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\Core\Formula\Functions\ComparisonGroup;

use Espo\Core\Formula\Exceptions\UndefinedKey;
use Espo\Core\Formula\Functions\BaseFunction;
use Espo\Core\Formula\ArgumentList;

class NullCoalescingType extends BaseFunction
{
    public function process(ArgumentList $args)
    {
        if (count($args) < 2) {
            $this->throwTooFewArguments();
        }

        $array = [];

        foreach ($args as $arg) {
            $array[] = $arg;
        }

        foreach (array_slice($array, 0, -1) as $arg) {
            try {
                $value = $this->evaluate($arg);
            } catch (UndefinedKey $e) {
                if ($e->getLevelsRisen() > 1) {
                    throw $e;
                }

                $value = null;
            }


            if ($value !== null) {
                return $value;
            }
        }

        return $this->evaluate($array[count($array) - 1]);
    }
}
